Indicator for elevators



(No Model.)

- J. LYNN.

v INDICATOR FOR ELEVATORS. No. 436,232. Patented Aug. 26, 1890.

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. UNITED STATES PATENT OFFICE" JOSEPH LYNN, OF l-IOLYOKE, MASSACHUSETTS.

INDICATOR FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 435,232, dated August 26, 1890.

- 7 Application filed May 15, 1890. Serial No. 351.897- (No model.)

To an whom it may concern:

Be it known that I, JOSEPH LYNN, of Hol yoke, in the county ofjlampden and State of Massachusetts, have invented a new and useful Safety-Indicator for Elevators, of which the following is a full, clear, and exact description.

This invention relates to the safety appliances 0f elevators, and has for its object to furnish a simple and practical device for the indication of defects in the operation of such appliances, whereby the condition of the automatic safety attachments to a passenger or freight elevator will be audibly manifested at every reciprocal movement of the elevator car or platform.

To this end my invention consists in certain features of construction and combination of parts, as hereinafter described, and indicated in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

' Figure 1 is a side elevation,partlyin section, of an elevator-car, the lower portion of a shaft in which the car reciprocates, a locking safety appliance on the car, and the improvement representedin connection with said devices, the car being shown at rest on the bottom of the shaft or passage-way, with the safetyclutch mechanism projected in locked adj 11stment with racks on the sides of the shaft;

and Fig. 2 is a side elevation of a portion of an elevator-car, safety-racks on opposite sides of the shaft in which the car reciprocates, a safety clutching device on the car in retracted adjustment, and the improved alarm shown in connection therewith.

A A are the opposite side walls of an elevator hollow shaft, in which the car B is designed to move vertically. Two opposite racks a are secured to the sides A of the elavator-shaft, the teeth on the same being cut in ratchet form to facilitate the engagement and upward sliding movement of the toes 12 which are portions of the bell-cranks O. The bell-crank levers O are preferably located within the car B, and are of similar forms, each consisting of a metallic bar bent at a right angle, producing horizontal limbs 12 and depending limbs b, from the lower ends of which latter the locking-toes Z) are laterally extended through slots in the car-walls to interlock with the racks a. At the corners c of the bell-cranks O perforations are made for their pivotal engagement with the depending bracket-arms c, which arms are secured on the under side of the top cross-bar B of the car. The adjacent end portions of the bellcrank limbs Z) are lapped upon each other and longitudinally slotted a short distance from their terminals, said end portions having lateral contact with the bracket-block d, to which they are loosely secured by a bolt d, transversely inserted through the slots in the end portions of the limbs 11 and also through the block. The block d at its upper end (1 forms the support for a semi-elliptic leaf-spring D, which bears with its ends 6 upon the lower surface of the cross-bar B. Aligning orifices are made through the bar B, spring D, and block d, through which the cable E is inserted and secured by its end to the block in any suitable manner.

Inspection of the figures will show that the operation of the safety-locking device 0011- sists in the projection of the toes 12 into contact with the racks a, when the weight of the car is removed from the cable E. The spring D, which is compressed, as shown in Fig. 2, when the elevator-car is suspended from the cable, by its resilience assumes its normal shape when the car is seated on the shaft-bottom, or when the cable breaks at any point in the shaft wherein the car moves and thus projects the toes I) outwardly.

Accidentscan only occur to a car provided the appliance herein described when said device is rendered inoperative by reason of the defective condition of the spring D, as that spring may become set or fractured and thus fail to throw the levers O properly so as to interlock their toes b with the racks a if the cable E should break. To avoid the dangerous contingency mentioned, an alarm or signal bell F is provided. This bell is located on one side of the bar B of the car, at a suitable point for an impinging contact therewith of a crank-hammer f. The limb g of this hammer is pivoted at g, and is engaged by a spring h, that when in a normal condition holds the hammer-head away from the bell, as shown in Fig. 2. Upon the lower terminal of the limb g a flexible connection 1' is secured by one end. This connection may be a chain or wire rope, and is attached at its opposite end to the block (1, the length of said chain i being so proportioned that when the cable E is slackened, if the spring D isin operative condition the bell-hammer f will be thrown against the bell and produce an audible signal. Should the bell F fail to sound when the elevator-car B reaches the bottom of the shaft wherein it reciprocates, the absence of this safety-signal will be an indication to the party in charge of the elevator that the spring D is defective and an immediate inspection of the mechanism imperatively necessary.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with a safety mechanism for an elevator-car, of a signaling device and means which will cause the signaling device to audibly sound when the elevator-car comes to a rest, substantially as set forth.

2. The combination, with an elevator-car, a safety clutching device thereon, and a cable which hoists the car, of a signaling device and means which will cause said device to audibly signal safety when the car rests and the cable is slackened substantially as set forth.

3. The combination, with an elevator-car, a pair of toothed racks, and safety-dogs adapted to interlock with the racks when actuated by a spring, of a semi-elliptic spring, a pendent car, and a device connected to the bracketblock and bell which will sound the bell when the cable is slackened, substantially as set forth.

JOSEPH LYNN.

Witnesses:

JAMES STOREY, WILLIAM HOWARD." 

